The use of hydraulic models by engineers, asset managers and planners is common place in activities linked to analyzing and managing water flows. Most commonly, the models are used in establishing the existing system performance and in testing various capital works or mitigation options.


         Figure: Possible DSS configuration

However, once developed, hydraulic models have another powerful use, as the core of a decision support system. The models can be used to investigate and optimize the system operation and the potential benefits are vast. The models can be run in off-line mode as a training tool, for example to investigate how best to manage a flood event, or to minimize the frequency of pump operations. In on-line mode, models can be used to provide operators real time forecasts of flows and water levels throughout the system and advise on strategies to maximize storage and minimize flood damage or spills.

This paper will present two NZ case studies where models are being utilized in the ongoing decision making process: the Hibiscus Coast Wastewater Network and Waikato River Flood Forecast system. The paper will highlight some of the techniques and tools used in enabling the model and its output to be used in this mode of operation.

> Download the full paper presented at the NZWWA 50th Annual Conference in September 2008 here [PDF, 4mb].

For further information, please contact Suzana Shipton, DHI New Zealand (szs@dhigroup.com).